Windows 7 is limited to 16GB anyway so even if you had 64GB RAM you wouldn't be able to use it. I think even the Ultimate edition is gimped to 32GB while I know Linux can use up to 128GB RAM so far. I want to use 32GB myself as I render a lot but alas unless I spend money on the ultimate edition or switch to Linux I'll be stuck to 16GB, even on Windows 8 I'm stuck at 16GB (not touching that though!).

like others have said unless you are doing any kind of intensive Video Editing or running high end ICE enhancer mods on GTA4 it would be pointless to have 32 GB .my Mobo supports 32GB too but I Doubt I will ever go beyond the 8GB I have now as I have never used it all on anything so far.

Windows 7 is limited to 16GB anyway so even if you had 64GB RAM you wouldn't be able to use it. I think even the Ultimate edition is gimped to 32GB while I know Linux can use up to 128GB RAM so far. I want to use 32GB myself as I render a lot but alas unless I spend money on the ultimate edition or switch to Linux I'll be stuck to 16GB, even on Windows 8 I'm stuck at 16GB (not touching that though!).